subtrapezial

sub·tra·pe·zi·al

(sŭb'tra-pē'zē-ăl),
Beneath the trapezius muscle; denoting a nerve plexus.

subtrapezial

(sŭb″tră-pē′zē-ăl) [″ + Gr. trapezion, a little table]
Beneath the trapezius muscle.